Grab a pair of dumbbells and stand tall in first position. Raise your arms overhead, bend elbows out to the sides, and lower the weights slightly behind your head. Brace your abs in tight and press up onto the balls of your feet. Extend your arms overhead slightly in front of your body, palms facing forward. Lower your heels and bend your elbows at the same time, lowering the weights behind your head (almost "shaving" the back of it). Repeat 20 times total.